Clarify why we're not using EnumerableOwnProperties

Closes #2020.

source

@@ -2900,6 +2900,7 @@ a.setAttribute('href', 'https://example.com/'); // change the content attribute
      <li>The <dfn data-x-href="https://tc39.github.io/ecma262/#sec-createdataproperty">CreateDataProperty</dfn> abstract operation</li>
      <li>The <dfn data-x-href="https://tc39.github.io/ecma262/#sec-detacharraybuffer">DetachArrayBuffer</dfn> abstract operation</li>
      <li>The <dfn data-x="js-EnqueueJob" data-x-href="https://tc39.github.io/ecma262/#sec-enqueuejob">EnqueueJob</dfn> abstract operation</li>
+     <li>The <dfn data-x-href="https://tc39.github.io/ecma262/#sec-enumerableownproperties">EnumerableOwnProperties</dfn> abstract operation</li>
      <li>The <dfn data-x="js-FunctionCreate" data-x-href="https://tc39.github.io/ecma262/#sec-functioncreate">FunctionCreate</dfn> abstract operation</li>
      <li>The <dfn data-x="js-Get" data-x-href="https://tc39.github.io/ecma262/#sec-get-o-p">Get</dfn> abstract operation</li>
      <li>The <dfn data-x-href="https://tc39.github.io/ecma262/#sec-getfunctionrealm">GetFunctionRealm</dfn> abstract operation</li>
@@ -8150,6 +8151,12 @@ https://software.hixie.ch/utilities/js/live-dom-viewer/?%3C%21DOCTYPE%20html%3E.
         </ol>
        </li>
       </ol>
+
+      <p class="note">The key collection performed above is very similar to the JavaScript
+      specification's <span>EnumerableOwnProperties</span> operation, but crucially it uses the
+      deterministic ordering provided by the [[OwnPropertyKeys]] internal method, instead of
+      reordering the keys in an unspecified manner as <span>EnumerableOwnProperties</span> does.
+      <ref spec=JAVASCRIPT></p>
      </li>
     </ol>
    </li>
@@ -119384,6 +119391,7 @@ INSERT INTERFACES HERE
   Ignacio Javier,
   Igor Oliveira,
   Ingvar Stepanyan,
+  isonmad,
   Iurii Kucherov,
   Ivan Enderlin,
   Ivo Emanuel Gon&ccedil;alves,